Measuring earthquake activity

• an earthquake with a magnitude of _ or less, is class as a ___ ____?

  2, micro earthquake
• deep focus EQs: __ to ___ km deep, involves high levels of ____, depth and _____, and minerals ____ type and ____ and lead to a large release of ____?

  70, 700, pressure, temperature, change, volume, energy
• shallow focus EQs: about __ km , they occur in ___, ____ rocks, fracturing due to ____, they are very ____, and involve low levels of _____?

  70, cold, brittle, stress, common, energy